Ontario, please be next!
https://www.cbc.ca/news/canada/british-columbia/b-c-adopting-year-round-daylight-time-9.7111657

CBC
Reactions mixed as B.C. to end time changes, adopt year-round daylight time | CBC NewsReactions range from applause to concern as March 8 will be the last time most British Columbians have to change their clocks, B.C. Premier David Eby announced Monday.
That was my thought too. Keep the time the same between Wall St. and Bay St.
their schedules are more different than alike. Different holidays. Different pre-market and post-market hours. Many different rules.
Some equities trade on half a dozen exchanges. Around the world.
There's no need to close markets on any particular timing now. They used to be closed on Fridays so they'd have 3 full days to do paper reconciliation. Now everything is in realtime.